Combine the first 7 ingredients in a medium bowl; stir well. Cover and let stand 8 hours. Add margarine and egg; stir well, and set aside.
Combine flour and next 6 ingredients (flour through mace) in a large bowl; make a well in center of mixture. Add tea mixture to dry ingredients, stirring just until the dry ingredients are moistened. Divide the batter evenly between 2 (7 1/2 x 3 3/4-inch) loaf pans coated with cooking spray. Bake at 350° for 50 minutes or until a wooden pick inserted in center comes out clean. Let cool in pans 10 minutes on a wire rack; remove from pans, and let cool completely on wire rack.
Note: Loaves can also be made in 3 (5 x 3-inch) disposable foil pans for gift giving, if desired. Bake at 350º for 45 minutes.
I made this for a book club brunch at which we discussed a book set in London. I figured this tea bread with tea would be the perfect themed snack. I was right. It's lovely - dense but not fudgy, and gets its sweetness from the berries and orange peel - no sugar! I used Irish breakfast tea in the batter and baked it in dark metal loaf pans. It was delicious with some hot Earl Grey. Guests with a sweet tooth drizzled some powdered sugar frosting on top.
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